we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ >>> our second story "outfront", a dire warning. this from britain's chief medical officer. the threat from drug-resistant bacteria is so serious that it could trigger a national emergency, similar to a terrorist attack. some pretty stunning words and it sure caught my attention, and "outfront" tonight, we're lucky to have dr. oz, host of "the dr. oz show." i've always wondered, people who go to the doctor every time they get sick and get antibiotics, are they causing a problem? are we going to have all these things be resistant to antibiotics? is she exaggerating? >> she's not exaggerating. i'm very concerned about this. the real question is what can we do about it? the reality is, we can't keep up with the bacteria. they're going to change much more rapidly than we develop new medica